The annular-ring fix held: five of five boards work
Part three. Same design, one inverted flag put back, a different assembler. Five of five rev E boards flashed, drove the display and read the sensor.
· 8 min read
manufacturing
4 posts
We told the fab the missing annular rings were intentional. They weren't.
Part two. The fab asked about one thing before building. We said it was deliberate. It was a parser bug, and it explains the open display headers.
· 8 min read
From 3D-printed enclosure to injection molding: when to switch
A single-cavity prototype steel tool for a palm-sized enclosure runs about $10k — we've had our own parts quoted. Here's the break-even math on when it pays.
· 10 min read
Custom PCB fabrication: three of five boards arrived dead
Three of five boards arrived dead and two had open joints. Test points found where power stopped, and later showed the open joints were our fault.
· 6 min read